Eccentric-shifting mechanism for steam-engines.



O.FERRARI. EGOENTRIG SHIFTING MECHANISM FOR' STEAM ENGINES.

APPLICATION FILED FEB. 2, 1911.

Patented July 23, 1912.

UNITED STATES PATENT OFFICE.

cAn rnnnAm, or ERIE, PENNSYLVANIA, AssIGNoR TO ERIE CITY IRON WORKS,-.OF

' .ERIE, PEN SYLVAN A, A CORPORATION OF PENNSYLVANIA.

"Toizll whom z' t'may concern:

fzen of the United States, residing'at Erie, 'in-the'county of Erie and State of Pennsyl- Q. Vania, have invented new and useful Improvements in Eccentric-Shifting Mechanism' for Steam-Engines, of which the following is a specification.

- This invention relates to eccentric shifting mechanism for steam engines, and consists in certain improvements inthe construction thereof as will be hereinafter fully described and pointed out in the claims.

-It is desirable with many classes of engines to be able to change the speed of the engine while running, and the object of this invention'is to provide a simple and eflicient means for accomplishing this result, by shifting the throw of the eccentric.

companying drawings as follows:

Fi e 1 shows a section on the line 1-1 ,i-n F1gs.'3 and 5. Fig. 2 is a plan view of the screw sup orting frame .with the in dex thereon. ig. 3- a section on the line .wheeh. Fig. 5 a section on the line 5-5 in Figs. 1 and 3.

l ma ks the engine shaft,2 the hub of. the fly wheel and 3 the eccentric shaft.

. The eccentric/shaft has a ring on its bolted to the end of the hub, thus securing the shaft; The shaft has the longitudinal the guide grooves 8 and the two parts are secured together by the blind screws 10.

The eccentric" has the cam projections '11 which extend'into thetlongitudinal slot 5 in the shaft 3. These cam projections 11 have the cam surfaces 12, the cam projections on the opposing projections being parallel and on a slant to the axis, oft-he shaft.-

Thecam 13 is arra' ged in the slot'5 and extends'through the eccentric and between Y Specification of Letters Patent.

The invention is illustrated in the ac 3-.3.in' F1g.' 1. Fig. 4 a section of'the ec-- centric shaft on the line 4-4 in Figs. 1 and 3, the views being toward the hub of-Q/e periphery next tothe h-ub,-and this ring is nccnN'r nIc-smrrINe MECHANISM FOR STEAM-ENGINES.

Patented July 23, 1912.

Application filed February 2, 1911. Serial No. 606,079.

the cam projections/11. The cam is of the I same slant as the siirfaces 12 so that as this cam is moved in an axial direction in the slot, the eccentric is moved in a radial direction, thus varying the throw of the eccentric while maintaining its circumferential relation to the shaft. The'catn is supported on the pins 14 and 15 which extend axially fromthe earn, the pin 14 being carried in the bore 6 and extending through said bore to the end of the shaft,,and the.

pin 15 extending into the bore 16 in the end of the engine shaft. v

The eccentric strap 17 is of ordinary construction, and is mounted on the eccentric. A The bearing end 18 ofthe shaft 3 is mounted in post 20. p The end of the pin 14:- has an'annular groove which is engaged by a. fitting 22,the end of theshaft outside of theand the fitting 22 forming 'a swivel joint. A- screw 23 is fixed in the fitting 22 bymeans the bearing 19 carried by a ove 21 of the pin 24. The screwextends" through i the nut 25 and is carried b'y-a screw-frame by the shoulders 27 and 28.1 Ahandxheel 29 is fixed on the nut between the shoulder 28. and the end of the frame 26.

It will bereadily seen that by turning the hand wheel 29, the nut 25 is rotated and screw in an axial direction, and this carries 26 extending from the-side of the 20.' .The nut 25 is locked against axial. movement this operating on the screw 23;.(thefiscrew being locked against rotation) moves thewith it the'pin 14 andthe cam13,thus-ef fecting a change in the throw of the eocen tric. It also will be observed that this be accomplished whil the engine as well as, when stat onary The pin 24 has an extension 30 whichex tends through the slbt-31- in the to .=of'- the frame 26. The pin hasthe index graduations 33 makes it, possibletoacc w rately adjust the cam to difierent jositionsa The xtension 30 also looks the" Hing-22 and screw 23 against rotation 'sothat therotation of the nut will'beactiveionthe screw in etfecting'an axial movement;- -What I claim asnew is:

the shaft; an eccentric slidinglyjmount- 8 at the top fjwhich in connection with the 81-0; "between said Iste'am ed on the guide and movable transversely f -'o f the anis of the shaft and tions extending-into the slot, said project-ions havingicam' ends; a cam arranged in the nds and-operating upon said cams to move the eccentric; and mechanism ior 'actuating e 'cam. r

;.2.. In an eccentric shifting mechanism for 1' thereof; a hub I engines 't-hecombination of an engine shaft havingan'aiial. bore in its end; an eceneieamee w having projecand movable transversely of the axis of the shaft; a cam arranged in the slot and havmg a pin extending therefrom into-the axial engine shaft and 5 opposite the end secured to the hub; hawngfaslongit-udinal slot therein; a guide 5 on bore; and means for actuating the cam.

4. In an eccentric shifting mechanism for steam engines the combination of a steam engine shaft having an axial bore int-he end thereon; an eccentric shaft secured to the hub and having a longitudinal slot therein and an axial bore in the end o the shaft; an eccentric slidingly mounted ed on the guide and movable transversely of on the guide and'movable transversely the axis of the shaft; a cam arrangedfin the jections extending into the slot for 'moving' the" eccentric to vary its 1 slot;

a pin'extending-from the cam into cam having pins extending into the axial shaft; and mechanism bores throw; thebore of the engine for actuatingthe' cam.

3. In an eccentric shifting mechanism for my hand in the a shaft witnesses.

steam engines, the combination of having a longitudinal slot therein'and an axial bore, said longitudinal slot extending totheend of the shaft; a guide on the shaft; an eccentric 'slidingly mounted on the guide axis of the shaft, and

and means for actuatingthe cam. a In testimony whereof I have hereunto setpresence of two subscribing CARL FERRARI.

'Witnesses:

BLAXCHE I'IARTJIAX, VINNIE C. Hess. 

